I. e ‧ lev ‧ enth 1 /ɪˈlev ə nθ/ BrE AmE adjective
1 . coming after ten other things in a series:
in the eleventh century
her eleventh birthday
2 . the eleventh hour the last moment before something important happens:
At the eleventh hour the government decided that something had to be done.
—eleventh pronoun :
I’m planning to leave on the eleventh (=the 11th day of the month) .
II. eleventh 2 BrE AmE noun [countable]
one of eleven equal parts of something